Olefin polymerization catalysts containing triquinane ligands
AssigneeEquistar Chemicals, LP
InventorJonathan L. Schuchardt
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Abstract
A catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an activator and an organometallic complex that incorporates a Group 3 to 10 transition metal and at least one chelating, dianionic triquinane ligand. The cis,syn,cis-triquinane framework is generated in three high-yield steps from inexpensive starting materials, and with heat and light as the only reagents. By modifying substituents on the triquinane ligand, polyolefin makers can control catalyst activity, comonomer incorporation, and polymer properties.
Claims19
A catalyst system useful for polymerizing olefins which comprises an activator and an organometallic complex, wherein the complex comprises a Group 3-10 transition metal and at least one chelating, dianionic triquinane ligand that is pi-bonded to the metal.
A method for preparing an organometallic complex useful for olefin polymerization, said method comprising:
- (a) converting a pentacyclic diketone to a triquinane diene;
- (b) doubly deprotonating the triquinane diene to produce a triquinane dianion;
- and
- (c) reacting the dianion with a transition metal source to give an organometallic complex that incorporates a chelating, dianionic triquinane ligand.
A method for preparing an organometallic complex useful for olefin polymerization, said method comprising:
- (a) reacting a cyclopentadiene and a p-benzoquinone to produce a Diels-Alder adduct;
- (b) photolyzing the Diels-Alder adduct to effect a [2+2] cyclo-addition reaction to give a pentacyclic diketone;
- (c) converting the pentacyclic diketone to a triquinane diene;
- (d) doubly deprotonating the triquinane diene to produce a triquinane dianion;
- and
- (e) reacting the dianion with a transition metal source to give an organometallic complex that incorporates a chelating, dianionic triquinane ligand.
Dependencies are inferred from the claim text.